I'm starting to learn away from the Zeiss now because I didn't know how hard it would be to do a manual focus.
But on the other hand, for me, it costs more to upgrade than it does to buy it right the first time. I don't like to upgrade. I didn't upgrade when I bought my telescope, I bought one of the best right off the bat and I'm happy with it.
What is the top of the line autofocus for Canon? Do they make a high end series?
Yes, anything that has a red "L" in the description and a red ring around the end of the barrel
But the L lenses are mostly designed for full-frame bodies, not crops, so by using them on a crop body, you will be carrying around extra weight. But hey, many people do it.
Personally, if you want the best-of-the-best, never-have-to-upgrade lens that would be useful on your T1i, I would look very strongly at the Canon 35mm f/1.4L ($1370), the Canon 135mm f/2L ($1000), or the Canon 70-200 f/2.8L IS II ($2300). Also the Canon 17-55 f/2.8 IS. It's not an L, but that's because of Canon's marketing decision never to make "L" lenses that are EF-S mount (i.e., that don't work on full-frame bodies). In almost all aspects, it is "L" quality.
I would particularly NOT recommend the 50mm f/1.2L or the 85mm f/1.2L -- both are weirdo, specialist lenses that I simply cannot recommend for a beginner. It will only end in frustration. If you want the 50mm or 85mm focal lengths, you can save a lot of money and frustration by getting the 50/1.4 (Canon or Sigma) and 85/1.8 (both $400 or less), both of which are much more manageable lenses.
I see it as kind of like the "I'm a beginner rider but I want to buy a supersport 600cc bike" debate that has raged in the Garage forum for the past few weeks. Photography is a hobby for most people. An enjoyable hobby. There is some pro-level gear that you can buy and start using right off the bat as a beginner, and it will help you take better photos regardless of your skill. But there are a few pieces of equipment that, while having their positives, also have limitations will really screw you up if you don't know what you're doing. And they could completely turn you off of the hobby if you spend all this money and don't get the results you want.
The 50L and 85L are both like that. The 50L has focus problems at certain f-stops, and you've got to know how to compensate and where the sweet spot of the lens is; and the 85L is super slow to focus. The 85L produces some of the most beautiful bokeh around, but it's pretty much strictly a portrait lens. The AF is super slow (because of the focus design -- the front elements move back and forth to focus, and the front elements are huge and weighty; other big lenses such as the super-telephotos focus using smaller, interior elements). Trying to use the 85L to take photos of, say, little kids running around the house, would be pretty rough. Sports with the 85L is out of the question, although its "on the face of things" specs (mild telephoto, extremely fast aperture) make it sound like it'd be perfect for indoor sports like basketball. But no, the 85/1.8 is much better there, because its AF is super fast. So again -- if you were a portrait photographer, the 85L would be a superb choice. For a somewhat general-purpose lens (as a 2nd lens almost certainly would be), it is a poor choice.
And again, 996GT2 is right, you lose only a bit of money buying and selling lenses, and if you buy used in the first place, you might lose little or nothing (often just PayPal and shipping fees). Check the used prices on the buy/sell forum at photography-on-the.net to see what the going prices are for used Canon lenses.
And, again. I wouldn't spend too much money until you've got some experience and know what you're doing. You sound like money isn't a problem, but seriously. Until you're comfortable spending 90% of your shooting time in full-Manual exposure mode, you won't have the knowledge to be able to even distinguish between some of the higher-end lenses. Buy a prime of some sort ($500 or less) and a constant-aperture zoom (such as the 17-55 f/2.8 IS).
And, as others have mentioned, your body will be in for an upgrade shortly if you spend much money on lenses. A 40D/50D/60D, 7D or 5D Mark II will be in order. I have debated this issue before and found it to be true. A full-frame body with cheaper, non-L primes will give better results than a crop body with L primes of equivalent focal length. Some examples below.
5D + 50mm f/1.4 > 50D + 35mm f/1.4L
5D + 85mm f/1.8 > 50D + 50mm f/1.2L
A full-frame body will provide tangible benefits with every lens you own (except for EF-S mount lenses, of course). A crop body simply wastes something like 60% of the image circle that an "L" or other full-frame lens creates.